Lidar Multiple Scattering in Water Droplet Clouds: Toward an Improved Treatment
- 12 Downloads
Although it has long been recognized that the effects of photon multiple scattering generally need to be accounted for in the analysis of lidar cloud returns, this is a difficult problem and current approaches are still rudimentary. The multiple scattering process is controlled by the size of the lidar beamwidth and the distance to the cloud, which jointly determine the lidar footprint, but cloud microphysical content (i.e., particle size, concentration, and shape) exerts a strong influence on the range distribution and depolarization of the returned energy. Since clouds are inherently inhomogeneous with height, it is our premise that vertically homogeneous cloud simulations based on idealized particle size distributions lead to misleading results. We offer a more realistic approach based on the contents of growing water droplet clouds predicted by a sophisticated adiabatic cloud model, which are offered for use as new standard vertically-inhomogeneous cloud models. Lidar returned signal and depolarization profiles derived from our analytical double-scattering method are given for inter-comparison purposes.
Key wordslidar multiple scattering cloud studies depolarization
Unable to display preview. Download preview PDF.
- 1.R.M. Schotland, K. Sassen and R.J. Stone: J. Appl. Meteorol. 10 (1992) 2914.Google Scholar
- 2.S.R. Pal and A.I. Carswell: Appl. Opt. 12 (1973) 1530.Google Scholar
- 5.A.I. Carswell and S.R. Pal: Appl. Opt. 19 (1980) 4123.Google Scholar
- 6.S.R. Pal and A.I. Carswell: Appl. Opt. 24 (1985) 3464.Google Scholar
- 7.K. Sassen, H. Zhao and G.C. Dodd: Appl. Opt. 31 (1992) 2914.Google Scholar
- 10.K. Sassen and H. Zhao: Proc. MUSCLE 4 (1991) p. 22.Google Scholar
- 11.L. Liao and K. Sassen: Atmos. Res. 34 (1994) 231.Google Scholar
- 14.K. Sassen and R.L. Petrilla: Appl. Opt. 25 (1986) 1450.Google Scholar
- 15.U. Wandinger: Ph. D. Dissertation, University of Hamburg (1994) p. 125.Google Scholar
- 17.D. Deirmendjian: Electromagnetic Scattering on Spherical Polydispersions (American Elsevier, New York, 1969) Chap. 4.Google Scholar
- 18.L. Bissonnette: Defence Research Establishment Valcartier, Electro-Optics Division, P.O. Box 8800, Courcelette, P.Q., GOA 1RO Canada (Fax: 418-844-4511, Email: email@example.com).Google Scholar